JP2002280159A - High-frequency heating cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make unnecessary slowly thawing with reduced electric power for preventing uneven thawing of thawing cooking in a microwave oven. SOLUTION: An HF wave generating means is composed of an upper part electrode 5 and a lower part electrode 6 and a high frequency electric power source 7. Frozen food can be thawed evenly and quickly by HF wave. In heating of cold stored and room temperature foods, microwave generated by a magnetron 3 is used for heating. At that time, the upper part electrode 5 is moved to the uppermost part of a heating chamber 2 by a rise and fall means 9 for efficient heating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating cooker for rapidly thawing and cooking food.

[0002]

2. Description of the Related Art Conventionally, as this kind of high-frequency heating cooker, a so-called microwave oven for performing thawing cooking and heating cooking using a microwave of 2450 MHz has been generally used.

[0003]

However, when the conventional microwave oven is used for thawing cooking, microwaves of 2450 MHz absorb 1000 times or more better in water than ice, so that ice melts into water. A phenomenon occurs in which power is concentrated on the changed part. Therefore, if the thawing is rapidly performed using a high power, large heating unevenness occurs. Therefore, the heating is prevented from being uneven by narrowing the thawing to a moderately low power.

[0004]

In order to solve the above-mentioned conventional problems, a high-frequency heating cooker according to the present invention is provided with a microwave generating means and an HF wave generating means. Thaw using HF waves, which have no significant difference between absorption of water and ice, to defrost quickly without uneven heating, and to heat non-cooked food quickly using microwaves during cooking. It is.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The invention according to a first aspect of the present invention comprises a main body, a heating chamber provided in the main body, microwave generating means for radiating microwaves into the heating chamber, and an HF wave in the heating chamber. And a high frequency heating cooker that performs thawing cooking by the HF wave generating means and performs heating cooking by the microwave generating means. Thaw the cooked food,
The temperature of the non-cooked food can be quickly raised by microwaves.

According to a second aspect of the present invention, in the first aspect, the HF wave generating means includes a parallel plate electrode provided in the heating chamber, and a high frequency power supply for supplying high frequency power to the parallel plate electrode. By using the high-frequency cooking device described, it is possible to uniformly irradiate the HF wave to the non-cooked food and to uniformly thaw.

According to a third aspect of the present invention, there is provided a high-frequency heating cooker according to the second aspect, wherein the high-frequency heating cooker is provided with means for raising and lowering the parallel plate electrodes, so that the distance between the electrodes can be changed. Accordingly, when performing thawing by HF waves, thawing can be performed at high speed without unevenness as an appropriate distance between parallel plate electrodes according to the size of the non-heated material.

According to a fourth aspect of the present invention, when microwaves are radiated, the distance between the parallel plate electrodes is set to a required distance, thereby providing a high frequency heating cooker according to the third aspect. By ensuring a microwave propagation path, heating and cooking can be performed efficiently.

According to a fifth aspect of the present invention, there is provided a mounting table which is sandwiched between parallel plate electrodes and on which non-cooked food is placed. When microwaves are irradiated, the distance between the mounting table and the electrode is set to a required distance. According to the high frequency heating cooker according to the third or fourth aspect, the non-heated food is uniformly irradiated with the microwaves and uniformly heated.

[0010]

FIG. 1 is a view showing the structure of a high-frequency cooking device according to the present invention. A heating chamber 2 is provided inside the main body 1.
Numeral 3 denotes a magnetron of a microwave generating means, which radiates a microwave into the heating chamber 2 via a waveguide 4. Reference numeral 5 denotes an upper electrode, and 6 denotes a lower electrode, which constitutes a parallel plate electrode. Reference numeral 7 denotes a high-frequency power supply for the parallel plate electrodes.
A high frequency power of 56 MHz is supplied. The upper electrode 5, the lower electrode 6, and the high-frequency power supply 7 constitute an HF wave generator. Reference numeral 9 denotes an elevating means for moving the upper electrode up and down. The arm 10 to which the upper electrode is attached can be moved up and down by the power of a motor 11. Reference numeral 8 denotes a mounting table on which the non-cooked food 12 is placed, and a predetermined distance is provided between the mounting table 8 and the lower electrode 6.

First, the case of performing thawing cooking by HF waves will be described. The non-cooked food is placed so as to be sandwiched between the parallel plate electrodes.
When a high frequency power of 3.56 MHz is supplied, a high frequency electric field indicated by a dotted arrow in the figure is generated between the electrodes. Unheated food is dielectrically heated by the high-frequency electric field. 13.
Since the HF wave of 56 MHz does not have a large difference between the absorption in ice and the absorption in water, even if the ice partially melts and becomes water during the thawing process, power is concentrated on that part and uneven heating occurs. There is no such problem, and the thawing can be performed uniformly and at high speed. In the present invention, since the upper electrode 5 and the lower electrode 6 form a parallel plate, the non-cooked food 12 can be placed at any position between the parallel plates, regardless of the size. Can be thawed uniformly. The thawing speed of the non-cooked food 12 is determined by the electric field intensity applied to the non-cooked food 12. Assuming that the voltage between the upper electrode 5 and the lower electrode 6 is constant, the shorter the distance between the upper electrode 5 and the lower electrode 6 and the non-cooked food 12, the stronger the electric field intensity applied to the non-cooked food 12 and the thawing speed. Is faster. However, if the distance is too short, a discharge occurs between the upper electrode 5 and the lower electrode 6, which is not preferable. Therefore, it is appropriate to set the shortest distance at which the discharge does not occur. The distance between the upper electrode 5 and the non-cooked food 12 can be adjusted by the user using the lifting / lowering means 9 or by providing a contact sensor on the upper electrode 5.
A method of lowering the upper electrode 5 so that the upper electrode 5 is once brought into contact with the non-cooked food, and then raising the upper electrode 5 by a predetermined distance to automatically set the upper electrode 5 is considered.

Next, the case of performing cooking by microwave will be described. Since microwaves absorb water much better than HF waves, they are suitable for warming refrigerated or normal-temperature foods. When the microwave is radiated from the magnetron 3 in a state where the upper electrode 5 is near the center of the heating chamber 2 as shown in FIG. 2, the microwave radiated between the upper surface of the heating chamber 2 and the upper electrode 5 5 and is not well absorbed by the non-cooked food 12. Therefore, when heating and cooking by microwave as shown in FIG. 3, first, the upper electrode is raised to the uppermost part of the heating chamber 2 by the lifting / lowering means 9. In this state, when the magnetron 3 is driven to emit microwaves, the microwaves reflected by the upper electrode 5 are absorbed by the non-cooked food 12, so that efficient cooking can be performed. The microwave radiated to the lower part of the mounting table 8 is reflected on the bottom of the heating chamber 2 and is absorbed on the bottom side of the non-heated food. Therefore, the non-cooked food 12 can be uniformly heated.

[0013]

As described above, according to the first aspect of the present invention, the frozen food can be thawed uniformly and at a high speed by the HF wave without thawing unevenness. In addition, refrigerated or normal temperature food can be warmed at high speed by microwaves.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-frequency heating cooker according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a problem of microwave heating of the high-frequency cooking device.

FIG. 3 is a view for explaining a method of solving the problem of the high frequency heating cooker by microwaves.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Heating chamber 3 Magnetron 4 Waveguide 5 Upper electrode 6 Lower electrode 7 High frequency power supply 8 Mounting table 9 Elevating means 10 Arm 11 Motor 12 Unheated food

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kazuhiko Asada 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. In-company (72) Inventor Koji Yoshino 1006 Kazuma Kadoma, Kadoma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 3K090 AA01 AB03 BA01 BA06 BA09 3L086 AA01 CC06 DA12 DA29

Claims (5)

[Claims] A main body; a heating chamber provided in the main body;
The microwave oven includes microwave generating means for emitting microwaves into the heating chamber, and HF wave generating means for generating HF waves in the heating chamber. Thaw cooking is performed by the HF wave generating means, and heating cooking is performed by the microwave. High frequency heating cooker performed by generating means. 2. The high frequency heating cooker according to claim 1, wherein the HF wave generating means includes a parallel plate electrode provided in the heating chamber and a high frequency power supply for supplying high frequency power to the parallel plate electrode. 3. The high frequency heating cooker according to claim 2, further comprising means for raising and lowering the parallel plate electrodes and having a structure capable of changing a distance between the electrodes. 4. When radiating a microwave, the distance between the parallel plate electrodes is set to a required distance.
A high-frequency heating cooker according to item 1. 5. The apparatus according to claim 1, further comprising a mounting table sandwiched between the parallel plate electrodes and on which the non-cooked food is placed, wherein a distance between the mounting table and the electrode is set to a required distance when irradiating the microwave. The high frequency heating cooker according to 3 or 4.